My dr. told me yrs ago after blood work that I need monthly b12 injections, although I don't see any difference. However I asked can't I just take b12 sublingual and she said no. Have any of you who are supposed to be low on b12 after testing just taken sublingual b12 and if so how much do you take? I am wondering if I can get the injections plus take the pill as I need ENERGY! I am so tired of being tired.